kotlin-stdlib/kotlin.collections/last

last

fun <T> Array<out T>.last(): T(source)
fun ByteArray.last(): Byte(source)
fun ShortArray.last(): Short(source)
fun IntArray.last(): Int(source)
fun LongArray.last(): Long(source)
fun FloatArray.last(): Float(source)
fun DoubleArray.last(): Double(source)
fun BooleanArray.last(): Boolean(source)
fun CharArray.last(): Char(source)

Returns the last element.

Since Kotlin

1.0

Throws

if the array is empty.

Samples

import kotlin.test.*

fun main() { 
   //sampleStart 
   val list = listOf(1, 2, 3, 4)
println(list.last()) // 4
println(list.last { it % 2 == 1 }) // 3
println(list.lastOrNull { it < 0 }) // null
// list.last { it < 0 } // will fail

val emptyList = emptyList<Int>()
println(emptyList.lastOrNull()) // null
// emptyList.last() // will fail 
   //sampleEnd
}
inline fun <T> Array<out T>.last(predicate: (T) -> Boolean): T(source)
inline fun ByteArray.last(predicate: (Byte) -> Boolean): Byte(source)
inline fun ShortArray.last(predicate: (Short) -> Boolean): Short(source)
inline fun IntArray.last(predicate: (Int) -> Boolean): Int(source)
inline fun LongArray.last(predicate: (Long) -> Boolean): Long(source)
inline fun FloatArray.last(predicate: (Float) -> Boolean): Float(source)
inline fun DoubleArray.last(predicate: (Double) -> Boolean): Double(source)
inline fun BooleanArray.last(predicate: (Boolean) -> Boolean): Boolean(source)
inline fun CharArray.last(predicate: (Char) -> Boolean): Char(source)
inline fun <T> Iterable<T>.last(predicate: (T) -> Boolean): T(source)
inline fun <T> List<T>.last(predicate: (T) -> Boolean): T(source)

Returns the last element matching the given predicate.

Since Kotlin

1.0

Throws

if no such element is found.

Samples

import kotlin.test.*

fun main() { 
   //sampleStart 
   val list = listOf(1, 2, 3, 4)
println(list.last()) // 4
println(list.last { it % 2 == 1 }) // 3
println(list.lastOrNull { it < 0 }) // null
// list.last { it < 0 } // will fail

val emptyList = emptyList<Int>()
println(emptyList.lastOrNull()) // null
// emptyList.last() // will fail 
   //sampleEnd
}
fun <T> Iterable<T>.last(): T(source)

Returns the last element.

Since Kotlin

1.0

Throws

if the collection is empty.

Samples

import kotlin.test.*

fun main() { 
   //sampleStart 
   val list = listOf(1, 2, 3, 4)
println(list.last()) // 4
println(list.last { it % 2 == 1 }) // 3
println(list.lastOrNull { it < 0 }) // null
// list.last { it < 0 } // will fail

val emptyList = emptyList<Int>()
println(emptyList.lastOrNull()) // null
// emptyList.last() // will fail 
   //sampleEnd
}
fun <T> List<T>.last(): T(source)

Returns the last element.

Since Kotlin

1.0

Throws

if the list is empty.

Samples

import kotlin.test.*

fun main() { 
   //sampleStart 
   val list = listOf(1, 2, 3, 4)
println(list.last()) // 4
println(list.last { it % 2 == 1 }) // 3
println(list.lastOrNull { it < 0 }) // null
// list.last { it < 0 } // will fail

val emptyList = emptyList<Int>()
println(emptyList.lastOrNull()) // null
// emptyList.last() // will fail 
   //sampleEnd
}
@ExperimentalUnsignedTypes
inline fun UIntArray.last(): UInt(source)
@ExperimentalUnsignedTypes
inline fun ULongArray.last(): ULong(source)
@ExperimentalUnsignedTypes
inline fun UByteArray.last(): UByte(source)
@ExperimentalUnsignedTypes
inline fun UShortArray.last(): UShort(source)

Returns the last element.

Since Kotlin

1.3

Throws

if the array is empty.

Samples

import kotlin.test.*

fun main() { 
   //sampleStart 
   val list = listOf(1, 2, 3, 4)
println(list.last()) // 4
println(list.last { it % 2 == 1 }) // 3
println(list.lastOrNull { it < 0 }) // null
// list.last { it < 0 } // will fail

val emptyList = emptyList<Int>()
println(emptyList.lastOrNull()) // null
// emptyList.last() // will fail 
   //sampleEnd
}
@ExperimentalUnsignedTypes
inline fun UIntArray.last(predicate: (UInt) -> Boolean): UInt(source)
@ExperimentalUnsignedTypes
inline fun ULongArray.last(predicate: (ULong) -> Boolean): ULong(source)
@ExperimentalUnsignedTypes
inline fun UByteArray.last(predicate: (UByte) -> Boolean): UByte(source)
@ExperimentalUnsignedTypes
inline fun UShortArray.last(predicate: (UShort) -> Boolean): UShort(source)

Returns the last element matching the given predicate.

Since Kotlin

1.3

Throws

if no such element is found.

Samples

import kotlin.test.*

fun main() { 
   //sampleStart 
   val list = listOf(1, 2, 3, 4)
println(list.last()) // 4
println(list.last { it % 2 == 1 }) // 3
println(list.lastOrNull { it < 0 }) // null
// list.last { it < 0 } // will fail

val emptyList = emptyList<Int>()
println(emptyList.lastOrNull()) // null
// emptyList.last() // will fail 
   //sampleEnd
}